GeForce GTX 680 and GeForce GT 640 OEM - video card comparison
GeForce GTX 680
GeForce GT 640 OEM
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK104
GK107
Market segment
Desktop
Desktop
Release date
March 2012
April 2012
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
Two 6-pin
None
SLI options
+
-
Boost clock speed
1058 MHz
-
Core clock speed
1006 MHz
797 MHz
CUDA cores
1536
-
Floating-point performance
3,090.4 gflops
612.1 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
3,540 million
1,270 million
Pipelines / CUDA cores
1536
384
Power consumption (TDP)
195 Watt
50 Watt
Texture fill rate
128.8 billion/sec
25.50
Memory type
GDDR5
DDR3
Maximum RAM amount
2048 MB
2 GB
Memory bus width
256-bit GDDR5
128 Bit
Memory clock speed
6000 MHz
1782 MHz
Memory bandwidth
192.2 GB/s
28.51 GB/s
Shared memory
-
-
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
1x DVI, 1x HDMI, 1x DisplayPort
Multi monitor support
4 displays
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 (11_0)
CUDA
+
3.0
OpenCL
1.2
1.2
OpenGL
4.2
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126